LAS VEGAS, NV - AUGUST 24: Singer Brandon Flowers of The Killers performs before a keynote address by U.S. President Barack Obama at the National Clean Energy Summit 8.0 at the Mandalay Bay Convention Center on August 24, 2015 in Las Vegas, Nevada. Political and economic leaders are attending the summit to discuss a domestic policy agenda to advance alternative energy for the country's future. (Photo by Ethan Miller/Getty Images)
